The Rust Bucket 3 is originally a standard issue Plumber jet. Kevin added some of his extra alien gadgets that he's picked up here and there. Originally, it was colored green and resembled a Concord. This jet was first used to find an alien that had been stealing from NASA. They used computer outlets to track down the alien and stop his plans. It first appeared in the first episode of Ben 10: Ultimate Alien, Fame, when Kevin said that he wanted to use "the Rust Bucket", but after Ben asked if Kevin actually wanted to drive all the way to Florida, Kevin said that they would use "the new one."